微波热解制备g-Fe2O3催化剂及其SCR脱硝性能

doi:10.3969/j.issn.0438-1157.2014.12.022

化工学报 ›› 2014, Vol. 65 ›› Issue (12): 4805-4813.DOI: 10.3969/j.issn.0438-1157.2014.12.022

• 催化、动力学与反应器 • 上一篇下一篇

微波热解制备g-Fe₂O₃催化剂及其SCR脱硝性能

王栋^1,2, 张信莉¹, 路春美^1,2, 韩奎华^1,2, 彭建升¹, 徐丽婷¹

1. 山东大学能源与动力工程学院, 山东济南 250061;
2. 燃煤污染物减排国家工程实验室(山东大学), 山东济南 250061

收稿日期:2014-05-17 修回日期:2014-08-22 出版日期:2014-12-05 发布日期:2014-12-05
通讯作者: 路春美
基金资助:
国家自然科学基金项目(51276101);山东省自然科学基金项目(ZR2012EEM013);高等学校博士学科点专项科研基金项目(20120131110022).

Microwave-assisted preparation of g-Fe₂O₃ as SCR catalysts

WANG Dong^1,2, ZHANG Xinli¹, LU Chunmei^1,2, HAN Kuihua^1,2, PENG Jiansheng¹, XU Liting¹

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China;
2. National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction, Shandong University, Jinan 250061, Shandong, China

Received:2014-05-17 Revised:2014-08-22 Online:2014-12-05 Published:2014-12-05
Supported by:
supported by the National Natural Science Foundation of China (51276101), the Natural Science Foundation of Shandong Province (ZR2012EEM013) and the Specialized Research Fund for the Doctoral Program of Higher Education (20120131110022).

摘要/Abstract

摘要： 以FeSO₄·7H₂O[Fe(NO₃)₃·9H₂O]为铁源,采用新型微波热解法制备γ-Fe₂O₃[a-Fe₂O₃]催化剂样品,通过XRD、N₂等温吸附-脱附、压汞法等实验手段对催化剂样品晶相、微观孔结构等进行表征;考察两种催化剂样品的NH₃-SCR脱硝性能,通过归一化处理得到两种催化剂在不同温度下的本征脱硝反应速率,同时对比研究了γ-Fe₂O₃与钒系催化剂的脱硝活性;研究氨氮比、氧浓度等运行参数对γ-Fe₂O₃催化剂NH₃-SCR脱硝性能的影响规律,并对其抗硫抗水性能进行考察.结果表明:采用新型微波热解法可得到纯度较高的γ-Fe₂O₃催化剂,其介孔分布合理且大孔数量丰富;同时γ-Fe₂O₃催化剂表现出优于a-Fe₂O₃催化剂的脱硝性能,400℃时最大NO_x转化率达到96%,300、325、350℃下单位面积脱硝速率达到a-Fe₂O₃催化剂的3倍左右;γ-Fe₂O₃催化剂具备优良的抗硫抗水性能,其最佳氨氮比为1、最佳氧体积分数为3.5%.

关键词: γ-Fe₂O₃, 催化剂, 微波, 热解, 选择催化还原, 脱硝

Abstract: γ-Fe₂O₃ and a-Fe₂O₃ catalysts were prepared respectively via a novel microwave pyrolysis method using FeSO₄·7H₂O and Fe(NO₃)₃·9H₂O as ferrous source. Crystalline phase and microstructure of catalysts were characterized by X-ray diffraction(XRD), mercury intrusion porosimetry(MIP), N₂ adsorption-desorption and NH₃-SCR activity of different catalysts were investigated. SCR reaction rates over the catalysts at different temperatures were obtained by unitary processing, and SCR activities over γ-Fe₂O₃ and vanadium-based catalysts were compared. The effects of O₂ concentration, molar ratio of NH₃/NO, SO₂, and H₂O on SCR activity of γ-Fe₂O₃ catalyst were also studied. Pure γ-Fe₂O₃ catalyst could be obtained via this novel microwave pyrolysis method, and showed higher crystallinity than a-Fe₂O₃ catalyst. γ-Fe₂O₃ catalyst had broader pore size distribution as well as appropriate ratios of mesopores and macropores. Meanwhile, γ-Fe₂O₃ catalyst exhibited better SCR activity than a-Fe₂O₃ catalyst. The highest NO_x conversion of γ-Fe₂O₃ catalyst was up to 96% at 400℃ and SCR reaction rates normalized by surface area were three times higher than that of a-Fe₂O₃ catalyst at 300, 325 and 350℃, respectively. The optimum molar ratio of NH₃/NO and O₂ concentration for selective catalytic reduction over γ-Fe₂O₃ catalyst were recommended to be 1 and 3.5% (vol), respectively.

Key words: γ-Fe₂O₃, catalyst, microwave, pyrolysis, SCR, DeNO_x

中图分类号:

X551

王栋, 张信莉, 路春美, 韩奎华, 彭建升, 徐丽婷. 微波热解制备g-Fe₂O₃催化剂及其SCR脱硝性能[J]. 化工学报, 2014, 65(12): 4805-4813.

WANG Dong, ZHANG Xinli, LU Chunmei, HAN Kuihua, PENG Jiansheng, XU Liting. Microwave-assisted preparation of g-Fe₂O₃ as SCR catalysts[J]. CIESC Journal, 2014, 65(12): 4805-4813.

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微波热解制备g-Fe₂O₃催化剂及其SCR脱硝性能

Microwave-assisted preparation of g-Fe₂O₃ as SCR catalysts

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